Request: Looking for dropper-post seat bags

[ERIJOHNS]

Couple years ago my brother and I rode the San Juan Hut System together on our FS bikes. Loved every minute of it. We want to go on some weekend singletrack bikepack trips this summer. I have a great setup but I'm missing a seat pack.

Between dropper post and rear shock, I'll have 5" of clearance between saddle and tire if I add in a wolftooth vallais. I think these bags would fit:

• Blackburn Outpost elite https://www.blackburndesign.com/p/outpost-elite-universal-bike-seat-pack-dry-bag/
• Bedrock Black Dragon https://www.bedrockbags.com/gear/black-dragon-dropper-seat-bag

Anyone have one for sale? Or experience of them?

Thanks! First post here.